Should I trust the quack who told me my epi-pen is good even though it's expired? It's for anaphylaxis from bee stings. Had my first ever bee sting at a powwow and the EMTs told me to get one.
They will hold their potency for a few years past the expiration date, but I'd still get another, when they are getting too old, or have been stored improperly the liquid viewable thru the window will start to yellow in them.
I still normally insist on a refill.
It's more of a personal security issue, it's probably still good, but it's your ass that will stop breathing, not the doctor's. Personally I feel more secure when stuff like that is not expired.
Kid has them too for bee stings, he pushed the mower into a nest of ground bees, ended up getting stung 5 or 6 times and broke out in hives all over shortly after. Dr said keep them on hand, better safe than sorry.